CORRELATION A DISTANCE CONSTANTE EN SISMIQUE REFRACTION*

Autor: C. Layat, A. Clément
Rok vydání: 1961
Předmět:
Zdroj: Geophysical Prospecting. 9:296-314
ISSN: 1365-2478
0016-8025
DOI: 10.1111/j.1365-2478.1961.tb01512.x
Popis: The usual computation methods in refraction seismic in the Sahara often involve considerable shot distances. Therefore, in addition to a high consumption of explosives, difficulties of operation and interpretation arise. In order to cut down the shot distances, it was necessary to study with great care the refracted waves having the shortest possible traveling path along the marker. Such paths correspond to the zone of great relative energy resulting, on one hand, from the sudden increase of reflected energy beyond the critical angle (total reflection) and, on the other hand, from the sudden appearance of refracted energy. The proposed method is founded on correlations of traces located in this “critical zone” on the different records shot on a profile; in order to get around certain difficulties due to insufficient knowledge of the marker velocity, the interpreter is led to select a constant correlation distance, at least for sections of the profile. The paper describes in detail the setting up and utilization of the proposed method, analyses a few examples and gives an estimate of the advantages and the restrictions of this method.
Databáze: OpenAIRE
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